// Update Undo/Redo Button State based on Undo Manager
protected void updateHistoryButtons() {
// The View Argument Defines the Context
editor.mainToolBar.setActionEnabled(
MainActions.ACTION_UNDO, undoManager.canUndo(graph.getGraphLayoutCache()));
editor.mainToolBar.setActionEnabled(
MainActions.ACTION_REDO, undoManager.canRedo(graph.getGraphLayoutCache()));
}
/** 重做上一步 */
public void redo() {
if (undoManager == null) return;
try {
undoManager.redo(graph.getGraphLayoutCache());
} catch (Exception ex) {
System.err.println(ex);
} finally {
updateHistoryButtons();
}
}